Floor Isolation System


Floor isolation systems are incorporated into building design to minimize floor impact noise and airborne sound transmissions. A “floated” floor (or rooftop) is supported by resilient mounts installed on the structural floor or rooftop. The design of an effective isolation system is dependent on several factors including:

  • Stiffness and mass of the structural floor
  • Isolation mount natural frequency and damping characteristics
  • Airspace height and venting
  • Mass and composition of the floated floor
  • Sound absorption in the airspace
  • Control of sound flanking paths.

Creating airspace between the structural and isolated floors while decoupling the two floors with the appropriate resilient mount effectively controls noise transmission. Maximum effectiveness of floating floor composite construction is achieved when the finished floor is fully isolated from the building structure and non-structural components, such as ductwork and piping.

An installed system can attenuate noise up to an STC rating of 72. Greater ratings can be achieved by adding a resilient ceiling below the space. Floating walls must be installed within the noise source room if flanking paths are to be minimized. Adding room absorption also helps in reducing noise reaching noise sensitive areas in the vicinity. Always consult an Acoustic Consultant where noise control measures are critical.

Advantages

  • Proven effectiveness over the lifetime of an installation
  • Quick installation time
  • Constant System natural frequency
  • Flexible capacities allow design for any load; from light wood floors to heavy mechanical equipment rooms.

Applications

  • Roof top mechanical equipment
  • Helipads
  • Manufacturing facilities
  • Instrument & nanotechnology facilities
  • Anechoic chambers
  • Residential dwellings and offices
  • Buildings near road or rail networks
  • Cinemas
  • Performing arts facilities
  • Concert halls
  • Bowling alleys
  • Nightclub dance floors
  • Broadcasting and recording studios
  • Conference rooms
  • Hotels
  • Gymnasiums
  • Home theatres
  • Hospital operating theatres
  • Plant rooms

Installation Procedure

Installation of the floating floor system is quick and easy. Decouple the area being under treatment by installing Perimeter Isolation Board around the perimeter of the required floating floor area. Additionally, Perimeter Isolation Board is used as a resilient break against any other non-isolated elements such as curbs, drains, ductwork, adjacent floors, pipe, and walls. The isolation mounts are then placed over the structural floor with standard spacing of 600mm~ each way keeping the first line of mounts away from the floating floor boundary by 300mm~. A pouring form is created by placing plywood on top of the isolators and is held together using junction plates and screws. Two layers of 6-mil polyethylene overlapped and taped at the seams covering the pouring form as temporary waterproofing. Concrete reinforcement is installed and then concrete poured in place. As dictated by the designer, trades can move about the floor to complete work in the space without the concrete having been cured to full strength – the floor is already positioned at final design elevation. The final installation step of the floating floor system requires removing the Perimeter Isolation Board tear strip and sealing the perimeter of the floating floor with resilient, non-hardening caulk.